KEB COMBIVERT F5 Reference Manual page 57

Technical Data
• Input resistance:
• Process data channel:
• Parameter channel:
• Clock signal output:
• Maximum input frequency:
• Encoder line number:
• Maximum cable length:
Cable length based on cable resistance
The maximum cable length is calculated as follows:
Length =
where
The following ENDAT encoders have been tested for use:
• Heidenhain ECN 1313, 413, 113 single turn
However, this does not restrict the use of rotary encoder with the same
specifications as other manufacturers.
The recognition of encoder loss or exchange is a software function and
is dependent on the encoder type. If the drive senses that the serial
communication to the encoder has stopped, it will trigger the 'Error Encoder
Interface' fault.

If the encoder is replaced or disconnected, the drive will trigger an
error or warning that the encoder was changed. The drive will display
the error message 'Error Encoder Interface'.
If the encoder was exchanged, the drive will auto reset the 'Error
Encoder Interface' fault. The user will need to learn the new encoder
position before the operation can continue. See section 5.10.
If there is an encoder-triggered fault or problems with the encoder
cable the 'Error Encoder Interface' fault will not clear, and the
problems must be diagnosed through parameter LE12. To clear the
'Error Encoder Interface' fault, it is necessary to go to parameter LE01,
press "Enter" and then press "Enter" again to confirm.
EnDat - Encoder Connections
120 Ohm
1Vpp
EIA RS485 half duplex
EIA RS485
200 kHz
1...2048 inc
100 m
V - Vmin 5.25V - 4.75V
=
Imax * R 0.2A * 0.03 W/m
Imax = supply current of encoder [amps]
V = voltage supply of the drive = 5.25V
Vmin = minimum supply voltage of the encoder
R = cable resistance (0.07 Ω/m) for Standard KEB cables
(0.03 Ω/m) for type "L" KEB cables
(based on signal levels, otherwise see below)
= 83.3 m
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